Name the band, line or zone that fits each clue…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the band, line or zone that fits each clue.
- A light band with a Z line in its middle.
- A dark band that contains myosin.
- The part of a myofibril between two successive Z lines.
- A thin membrane that holds the thick filaments together in the middle.
- The central part of the thick filaments that the thin filaments do not overlap.
Need a reminder? The key ideaShow
The sarcomere lies between two Z lines. The A band is as long as the thick filaments. The I band holds only thin filaments. The H zone is the part of the A band that the thin filaments do not reach. In the model, the thick filament is u and each thin filament is u.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The I band.
Step 2. (b) The A band.
Step 3. (c) The sarcomere, the functional unit of contraction.
Step 4. (d) The M line.
Step 5. (e) The H zone.
Answer: (a) I band; (b) A band; (c) sarcomere; (d) M line; (e) H zone.
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